Molding-machine.



A. GOLTON & B. W. SCOTT.

' MOLDING MACHINE.

APPLIOATION FILED 131N130 1914.

Patented Sept. 29, 1914.

6 SHEBT SSKEET 1.

v muvaoxs u h: Q 0: 0w cmc\/ B MWNS WW.

BY olwalwl. m

firm/My WITNESSES: f ,1 WWW A. GQLTON &B.. W. SCOTT.

MOLDING MACHINE. I

APPLICATION FILED JAN 30,1914.

1,1 1 1,879. a n d Sept. 29, 1914.

5 SHEETSSHEET 2.

A. OOLTON & B. W. SCOTT.

MOLDING MACHINE.

APPLICATION FILED JAN.,30,,1914.

1,1 1 1,879. Patented'Sept.29,1914.

s snnmysnnm 3.

A. COLTON & B. W. SCOTT.

MOLDING MACHINE.

APPLICATION FILED mmso, 1914.

1, 1 1 1,879, I Patented Sept. 29, 1914.

5 SHEETSSHEET 4.

I BwX0BWm.$ oX K 4 7 MW /1 20mm I A. COLTON & B. W. SCOTT.

MOLDING MACHINE.

APPLICATION FILED JAN. 30, 1914.

Patented Sept. 29, 1914.

5 SHBETSSHEBT 5.

UNITED STATES PATENT GFFICE. ARTHUR COLTON- m nun'rou w} scoTT, oronnTnoT, mIomeAmAssmNoRsTo ARTHUR coLTon COMIPARY, or DETROIT, mremean, AconronATron or MICHIGAN.

MOLDING-MACHINE.

Specification of Letters raga. V Patented Sept. 29,1914.

To all Tahom it may c oncern: V

Be it known that we, ARTHUR (JoLToN and I BURTON W. SCOTT, citizens of,the United States, and residents of Detroit, in the county of Wayne andState of Michigan,

have invented a new and Improved Molding-Machine, of which the followingis a specification.

This invention relates to machines for forming medicinal tablets and itsobject is to provide'mean's. for automatically filling the apertures ina mold plate with a medicinal mass, and then removing the finishedtablets, which means shall be simple in construction, rapid inoperation, and entirelyautomatic.

This invention consists in a mold plate provided with a series of groupsof apertures,

each aperture of, the exact size of the desired tablet, a chamber forthe material to be formed into tablets, a movable carrier, a device forcompacting the material into the apertures to form tablets, means forremoving the. tablets from the apertures, and.

actuating mechanism to move the chamber from the container to thecompacting device andmove the mold plate with its apertures below thechamber so that they may filled, then move the mold plate until thefilled apertures are in proper position relative to theremoving deviceand then actuate, the latter.

In the drawings, Figure 1.is a plan of the machine, certain of the partsbeing broken away for the sake of clearness. Fig. 2 is a side elevation,portions of the base, together with the hopper and the face of the gearcasing, being removed for the sake of clearness. Fig. 3 is averticalsection on the line 3-3 of Fig. '1, looking in the directionindicated by the arrows. Fig.4 is a horizontal section on the line 44 ofFig. 2. Fig. 5 is a fragmentary side elevation showing the punchoperating mechanism and the mechanism for removing the tablets frombeneath the mold plate. Fig. 6 is a 'frag-,

mentary vertical sectionshowing the relation of the hopper, the rotarytable, the

'mold 'plate and the wiper. Fig. 7 isa plan view of thewiper.

Application filed January 30, 1914. Serial No. 815,376.

described. l

The frame '(Fig. 3) may have formed thereln a bearing 10 and a tubularextension 11, that may be provided with an upwardly extending flange 12and .a downwardl' depending flange 13. The driving sha t 14,

having the driving pulley 15 rigidly secured thereon, may be rotatablysupported at one end in the bearing 10, and at its other end in a sleeve16 carried in the tubular exten and seated upon the base plate 2 is aframe 3, the details of which will be hereinafter.

sion 11, and may have rigidly secured thereto the worm gear-18 and thebevel gear 17 Secured to the flanges -l2gand 13 in any desired manner,such asby means of the bolt member that comprises an upper bearing 22, agear casing23, and a lower bearing '24, the latter being preferablyprovided with the gland 25 attached to its lower end to pre- 20 andthumb-nuts 21, (F igs'. 1- and 2) is a,

ventlubricants from escaping. Mounted to reciprocate in the bearings isa rotatable shaft 26 that is connected by a spline 27 to slide in butrotate with the bevel gear 28,

the latter meshing with the bevel gear 17. The shaft 26 has scoured toits-lower end a wiper 30;

The worm 18. engages with andj'rotates the worm-wheel 40, (Figs, 2 and3), to

which a bevel gear face 41 may be'secured;

by meansof the screws 42, the worm-wheel andgear face being mounted onthe horizon'tahshaft 43 that turns in'a bearing 44 formed on the-side ofa gear-casing 45, ac-

cess to the interior ofwhich may be had by' means ofthe cover-plate 46(Fig. 1), which plate is omitted in Fig 2. Engaging with the bevel gearface 41isaa bevel gear '50, rigidly secured to a vertical shaft 51' thatis mounted to turn in the upperbearin 52 and the lower boss 53' (Fig; 3)on the rame 3. Tothe upper end of the shaft 51 is rigidly .secureda 'cam60, having a-groove therein that comprises the inclined portions -61,theends of which are connected by the lower horizontal portion 62 and theupper horizontal portion 63. The upper endfof the shaft also has rigidlysecured thereto the pulley 64, the purpose of which will be hereinafterindicated. 7

, ,Running in the groove in the cam GO-is a roller 70 thatis mounted ona pin 71- carried by one' end of a lever 7 2', .which may be rigidlysecured to a shaft'l'? that turns in 1 The shaft 26 is extended upwardlyabove the nuts 79 to constitute a guide and support for the weight 81that'may rotate and slide longitudinally thereon. Secured to the weight81 is a vertical rod 85, that may slide in the bearing 86 formed on theframe, and rigidly attached to the lower end of the rod is a presseryoke 87, the divided laterally ex tending end 88 of which is received ina groove 89 in a presser foot 90 that is slidably and may also berotatably mounted on the wiper 30.

It will be seen that rotation of the cam will swing the lever 72 aboutits pivot and cause a reciprocation of the shaft 26, and

that the wiper 30, weight 81, rod 85, yoke,

87, and the presser foot 90, will be elevated on one stroke and loweredon the next. It will also be noticed, that, whereas the'parts mentionedare all positively elevated, and the shaft 26 and wiper 30 arepositively lowered, the weight 81, rod 85, and the presesr foot aremerely lowered by the action of gravity, inasmuch as the weight 81 isslidable upon the upper portion of the shaft 26.

The wiper 30 may be attached to the shaft 26 by the screw-joint, andcomprises a series of radially extending arms 92, having beveled orinclined sides 93, the upper edge of each of which is at the forwardside of the respective arm, as regards the normal angular motion of theshaft 26 (shown by the arrow in Fig. 7).

The frame 3 is provided with a downwardly depending boss that is inalinement with the boss 53 and passes through an opening in themain-baseplate 2, to afford a further bearing for the shaft 51, whichextends through the boss 95 and has secured to its lower end a mutilatedgear 96 (Fig. 1) This gear engages with and intermittently rotates thegear 97 thatturns upon the shaft 98, mounted in a boss 99 formed on themain base plate. A second gear 100 is mounted on the same shaft torotate with the gear 97, and drives the third gear 101 that is rigidlyconnected to a shaft 102, mounted to turn in the boss 103 which isformed on the main base plate 52. The shaft 102 extends upwardly throughthe base plate and has rigidly secured thereto above the plate, a collar104, (Fig. 6) to the upper face of which a rotatable disk-shapedmold-plate 105 may be clamped by means of the washer 106 and the nut 107on the upper end of the shaft 102. This mold plate is provided with aseries of groups of perforations 110, and turns in an arc-shapeddepression "111 formed in the table 112 that rests upon the main baseplate.

The mold plate is prevented from rotating in either direction, duringthe time that the teeth of the mutilated gear 96 are out of engagementwith the teeth of the gear 97 ,by a stop-plate 116 secured to the lowerside of the gear 96 by the pins 117, with which plate two pins 119, thatproject downwardly from the face of the gear 97, are adapted to enage.

Material is fed to the mold plate by mechanism that will now bedescribed: To the lower end of the shaft 51 is fixed a rotary plate(Figs. 2 and 1) that may be provided with a lateral projection 126, uponthe upper face of w hich a roller 127 may be mounted to turn on the pin128, this roller being adapted to engage in any one of the series ofslots 1 9 formed in the Geneva wheel 130. The wheel 130 is rigidlyconnected to a shaft that passes through the boss 136 which projectsfrom the lower face of the base plate 2, the shaft having fixed theretoat a point just above the base plate the collar 137 (Fig. 6), to theupper face of which the rotary feed-plate 138, having a series ofcylindrical chambers 139 therein, may be clamped by the nut 1 10 andwasher 141. The inner diameter of each of the chambers 139 is slightlygreater than the exterior diameter of the wiper'30.

The feed-plate is prevented from rotating in either direction, duringthe time that the roller 127 is out of engagement with any of the slots129, by a circular locking are on the upper face of the plate 125 in themanner usually found in Geneva movements.

The chambers 139 in the Geneva wheel are supplied with material from thehopper 1.50 that may be mounted in a bracket 151, the hopper preferablybeing provided with an agitator 152 that is kept in motion by a pulley153, driven from the pulley 64, heretofore referred to, by means of thebelt 154.

Assuming that material has been forced into the openings in the moldplate, it is removed therefrom by the following mechanism: Upon theouter end of the shaft 4-3 (Figs. 1 and 5) is rigidly secured a rotarycam 156 that has formed in its inner face a cam-groove shown in dottedlines in Fig. 5, and comprising an outer circular portion 158, an innercircular portion 159, and connecting portions 160. Running in thiscamgroove is a roller 162 that may turn upon a pin 163, carried by oneend16 1 of a bellcrank that is mounted on a pin pivoted in a hub 165formed on the casing 2. The outer end 166 of the bell-crank is dividedto form bifurcations, the end of each of which is provided with arounded enlargement .167. Loosely held. between the enlargements bymeans of the washers 173 and 174 and the in the bearing and is preventedfrom turning angularly in respect thereto by the key 176 and slot 177 inanobvious manner.

The lower end of the shaft 171 has attached tion 186, at right anglestothe axis of the cam, and a connecting portion 187. Running in, thisgroove is a roller 188 that may turn on a pin 189 carried by thedischarge arm 190 which is pivoted to the base-plate 2 at 191. The outerend of the arm may be curved, as indicated at 192, and is positionedbeneath the mold plate 105. It is apparent that the discharge arm is'swung back and forth beneath the mold plate at each rotation of the cam156, and that its motion may be so timed, in respect to the, movement ofthe punches, as to remove the finished articles from beneath the moldplate.-

A band or rim 144 may be secured to the circumference of the chamberedfeed-plate 138 to prevent the material from the con tainer 150 fromspilling over the ed c.

This device is especially-adapted or forming medicinal tablets fromloose powdered materials, preferably moistened with alcohol or othervolatile liquids to form a plastic mass. The plastic substance is placedin the container and kept stirred, and as the chambers 139 come underthe lower end of the container, these chambers are filled. The wiper 30,by means of its arms, wipes or pastes the plastic mass into the openingsor apertures 110 in the mold plate in su'ch'a manner that the tabletwill be very compact, and when the'liquid has evaporated, the tabletswill be of any desired hardness, especially as the downward force of thepresser foot 90 can be varied.

Operation: It is evident that when one of the chambers 139 in thefeed-plate 138is in the position shown in Fig. 6, it will be filled withmaterial from the receptacle 150. During the time the filling is takingplace, the

feed table is prevented from turning by the Geneva wheel 130 and thelocking are 145. As the plate 125 continues to turn the looking are 145passes out of engagement with the Geneva Wheel 130 and permits theroller 127 to turn the wheel 130 one step. The stem 60 is so set inrespect to the shaft 43 as to cause the lever 727 5 to elevate theconstantly rotating shaft 26, the wiper 30, and the presser foot 90 justbefore the feed-plate begins to turn, and to hold these parts above thefeed-plate until it again becomes stationary. As soon as the feed platehas ceased to revolve, the cam 60 positively lowers the shaft 26 andthewiper 30 into the chamber 139, which has been previously filled andwhich was brought into axial alinement with the shaft 26 by the partialrotation of the feed-plate just described. At the same time the weight81 and rod 85 together with the weightof the presser foot 90, cause thelatter to press upon the upper surface of the plastic materialin thechamber and feed it to the rotating wiper 30. At about the instant thatthe wiper enters the chamber 139, the teeth on the mutilated gear 96come into engagement with the teeth on the ear 97, thereby turning thegear 101, the sha t 102 and the mold plate 105 rather slowly in thedirection indicated by the arrow in Fig. 1. As the openings 110 in themoving mold plate pass beneath the wiper,

the forwardly inclined lower surfaces .93

gear 96 pass out of engagement with the teeth on the gear 97, the pins119 and 120 come into contact with the lock-plate 116, thereby holdingthe mold plate stationary. Shortly thereafter the roller 162, that hasbeen traveling in the circular portion 158 of the groove in the cam 156,passes into the inclined portion 160 and turns the bell-crank about itsaxis, depressing the punch and pushing the previously molded articlesout of the openings in the mold plate. At the end of thepunching stroke,the roller travels for a short time in the circular portion 159 of thegroove, then up the other inclined portion 160 and into the circularportion 158 to elevate the punch and retain it in elevated position. Thegroove in the outer face of the sam 156 is so located angularly of thecam as to cause the discharge arm 190 to be positioned at its innerlimit of movement in respect to the mold plate, when the punch latedescends. Shortly afterward the inclined portion 187 of the groove comesinto contact with the roller and swings the arm 190 outwardly about thepivot 191,

thereby removing the molded articles from beneath the mold plate, afterwhich the arm is returned by the inclined portion 185 of the groove."The parts 159 and 160 of the cam pass the roller 162 while the moldplate is Having describedfour invention, what we desire to secure byLetters Patent is I 1. In a molding machine, a movable feed plate havinga chamber therein, a movable mold plate having an apertured portion thatpasses beneath said chamber, atable beneath the mold plate and inclose'engagement with the lower surface thereof, a rotary member,

terial contained therein into the aperture in the mold plate, and meansfor moving the moldplate while the rotary member is prodirection whilein jected into the chamber.

3. In a molding machine, a movable feed plate having a chamber therein,a movable mold plate having an apertured portlon that passes-beneathsaid chamber, a table beneath the mold plate and in close engagementwith the lower surface thereof, a ,movable member adapted to agitate thematerial, means for moving the movable member in one direction toproject it into the chamber, means for moving a portion of the member inanother the chamber, to force the material contained therein into theaperture in the mold plate, and means for moving the mold plate whilethe member is in the chamber.

t. In a molding machine, a movable feed plate having a chamber therein,a movable mold plate having an apertured portion that passes beneathsaid chamber, a-table beneath the mold plate and in close engagementwith the lower surface thereof, a rotary member, means for projectingthe rotary member into the chamber to force material contained thereininto the aperture in themold plate,

' and means for feeding material in-the chamber to the rotary member.

5. In a molding machine, a rotary feed plate having a chamber therein, arota mold plate having a portion rovided wit apertures that pass beneatht e chamber, a table beneath the mold plate and in close en- 1 gagementwith the lowerlsurface thereof, a

rotarywiper, means for projecting the wiper into the chamber, and meansfor rotating the wiper when in the chamber to force material into theapertures in the mold plate.

6. In a molding machine, a movablemem-i ber having a chamber therein, amovable mold plate having neath the chamber, a table beneath the moldplate and in close engagement with'the lower face thereof, a rotarymember, means for an apertured portion beprojecting said rotary memberinto the chamber, said member comprising a for- I wardly inclined facethat serves to force matenal contained in the chamber into the aperturein the mold late.

7. Ina molding mac ine, a movable mem ber having a chamber therein, amovable mold plate having a portion provided with openings that passbeneath thechamber, a table beneath the mold plate and in closeengagement with the lower facethereof, a rotary member in'the chamber,said member constructed to force material in the chamber into theopenings in the mold plate, and means for moving the mold late while themember is forcing materia into the openings therein.

8. In a molding machine, a rotary feed plate having a chamber therein, arotary mold plate having a portion provided with apertures that passbeneath the chamber, a

fixed table beneath the mold plate and in close engagement with thelower surface thereof, a movable member therear edge of which lies inclose proximity to the face of the mold plate, means for projecting'themember into the chamber from above, means for moving the member while inthe chamber, a second member adapted to be projected intothe chamberbehind the first mentioned member to feed material to the latter, andmeans for movin the mold plate while'the members are in t e chamber.

9. In a molding machine, a member having a chamber therein, a movablemold plate having a portion rovided with an opening that passes beneatthe chamber, a table beneath the mold plate and in close engagement withthe lower surface thereof, a movable member in the chamber having aforwardly inclined face, means for'moving the last mentioned member, anda second movable member in the chamber, said second movable member beingmovable longitudinally of the chamber in respect to the member havingthe forwardly inclined face and serving to feed material thereto and thelatter serving to 'force the material into the opening in the moldplate.

10. In a molding machine, a member having a chamber therein, a movablemold plate having a portion provided with an o ening that passes beneaththe chamber, a ta le beneath the mold plate and in close engagement withthe lower surface thereof, a mov-.

able member in the chamber, means for moving the last mentioned member,a second movable member in the chamber, said second movable member beingmovable 1ongitudinally of the chamber in respect to the first mentionedmovable member in the chamber,"

said member serving to feed material tothe first mentioned. movablemember in the chamber, and the latter serving to force the material intothe opening in themold plate,

and means for moving the mold plate while material is being forced intothe opening therein.

11. In a molding machine, a rotary feed plate having a cylindricalchamber therein, a rotary mold plate having a portion pro+ vided with aseries of openings that pass beneath the chamber, a table beneath themold plate and in close engagement with the lower surface thereof, arotatable shaft with which the cylindrical chamber may be brought inaxial alinement, a wiper fixed to the end of the shaft, means forreciprocating the shaft to project the wiper into the chamber, a presserfoot adapted to enter the chamber behind the wiper to feed material tothe latter, which in turn forces it into the openings in the mold plate.

12. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, arotary mold plate having a portion,

that passes beneath the chamber andsaid portion having a series ofopenings extending through it, a table beneath the mold plate and inclose engagement with the lower surface thereof, a rotatable shaft withwhich the cylindrical chamber is brought into axial alinement during theperiod between two of the steps of its intermittent movement, a wipe;fixed to the shaft, means for reciprocating the shaft to project thewiper into the chamber while the latter is in axial alinement with theshaft, and means for rotating the mold plate while the wiper is rotatingin the chamber.

13. In a molding machine, a rotary feed plate havinga cylindricalchamber therein, means for intermittently rotating the-feed plate, arotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extend ing through it, a tablebeneath the mold plate and in close engagement with the lower surfacethereof, a rotatable shaftwith which the cylindrical chamber is broughtinto axial alinement during the period between two of the steps of itsintermittent movement, a wiper fixed to the shaft, means forreciprocating the shaft to project the wiper into the chamber while thelatter is in axial alinement with the shaft, a feeding mechan sm adaptedto enter the chamber behind the wiper to feed material thereto, andmeans for rotating the mold plate while the wiper is rotating in thechamber.

14. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, arotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extending through it, a tablebeneath the mold plate and in close engagement with the lower surfacethereof, a rotatable shaft with which the cylindrical chamber is broughtinto axial taking place While said wiper is inserted within the chamber.

15. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, arotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extending through it, a tablebeneath the mold plate and in close engagement with thelower surfacethereof, a rotatable shaft with which the cylindrical chamber is broughtinto axial alinement during the period between two of the steps of itsintermittent movement, a wiper fixed to the shaft, means forreciprocating the shaft to project the wiper into the chamber while thelatter is in axial alinement with the shaft, a presser foot movablelongitudinally in respect to the shaft and adapted to enter the chamberbehind the wiper to feed material thereto, and means for intermittentlyrotating the mold plate, said rotation taking place while the wiper isinserted within the chamber.

16. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed 10o plate,means for holding the plate stationary at the close of each step in itsrotation, a rotary mold plate having a portion that passes beneath thechamber and said portion having a series of openings extending throughit, a table beneath the mold plate and in close engagement withthe lowersurface thereof, a .rotatable shaft with which the cylindrical chamberis'brought into axial alinement during one of the periods that the feedplate is held stationary, means, for rotating the shaft, a wiper fixedto the shaft,

. means for'reciprocating said shaft to project.

the wiper into the chamber while the chamber is in alinement with theshaft, an annul ar presser foot slidably mounted on the wiper, a weightfor projecting the presser foot into the chamber behind the wlper tofeed material thereto, and means for rotating the mold plate while thewiper is rotatno ing in the chamber.

17. In a molding machine, a rotary feed plate 'havin a cylindricalchamber therein, means for mtermittently rotating the feed plate, meansfor holding the plate statlonary at the close of each step in itsrotation, a rotary mold plate having a portion that passes beneaththe-chamber and said, portlon having a series of openings extendingthrough it, a table beneath the mold plate and in close 139 chamber isbrought into axial alinement durmg one of the periods that the feedplate is held stationary, means fo rotatin the shaft,

a wiper fixed to the shaft, means or reciprocating said shaft to projectthe wiper into the chamber while the chamber is in alinement with theshaft, an annular presser foot slidably mounted on the wiper, a weightfor projecting the presser foot into the chamber behind the wiper tofeed material thereto, means for rotating the mold plate while thewiperis rotating in. the chamber, means for holding the mold platestationary at other times, and means for removing molded material fromthe, openings therein while the mold plate is held stationary.

18. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, meansfor holding the plate stationary at the close of each step in itsrotation, a rotary mold plate having a portion that passes beneath thechamber and said portion having a series of openings extending throughit, a table beneath the mold plate and in close engagement with thelower surface thereof, a rotatable shaft with which the cylindricalchamber is brought into axial alinement during one of the periods thatthe feed plate is held stationary, means for rotating the shaft, a wiperfixed to the shaft, means for reciprocating said shaft to project thewiper into the chamber while the chamber is in alinement with the shaft,an annular presser foot. slidably mounted on the wiper, a weight forprojecting the presser foot into the chamber behind the wiper to feedmaterial thereto, means for rotating the mold plate while the wiper isrotating inthe chamber, means for holding the mold plate stationary atother times, vertically reciprocating punches adapted to force moldedmaterial from the openings in the mold plate while the latter is heldstationary, and means for thereafter removing the molded material frombeneath the mold plate. a

19. In a molding machine, a hopper having an opening in the bottomthereof a rotary feed plate, the upper face of which is in proximity tothe epening in the hopper, the feed plate havinga series of openingstherein, means for intermittently rotating the feed plate, means forholding the plate stationary at the close of each step in its ro tation,a rotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extending through. it, a tablebeneath the mold plate and inclose engagement with the lower surfacethereof, a rotatable shaft with 'which the cylindrical chamber isbrought into ax1al alinement during one of the periods that the feedplate is held stationary,

means for rotating the shaft, a wiper fixed to the shaft means forreciprocating said shaft to pro ect the wiper into the chamber while thechamber is in alinement with the shaft, an annular presser foot slidablymounted on the wiper, a weight for projecting the presser foot into thechamber behind the wiper to feed material thereto, and means forrotating the mold plate while the wiper is rotating in the chamber.

20. In a'molding machine,a feed'plate having a seriesof chamberstherein, means for intermittently rotating the feed plate, means forholding the feed plate stationary at other times, a rotating shaft withwhich the chambers successively come into axial alinement, a wiper onthe shaft, means for reciprocatin the shaft to cause the wiper to enterthe c amber that is in alinement therewith, an annular pressure footslidably mounted on the wiper and arranged to enter the chamber behindthe wiper and feed material thereto, and a weight connected thereto fordetermining the pressure that the presser foot may apply to thematerial.

21. In a molding machine, a rotary feed plate having a chamber therein,a movable mold plate having a portion provided with a series of openingsthat pass beneath the chamber, .a table beneath the mold plate and inclose engagement with the lower surface thereof, a rotary member, andmeans for changing the relative location of the rotary member and themold plate to cause the rotary member to force material into theopenings in the mold plate.

22. In a molding machine, a movable feed plate having a chamber therein,a mold plate beneath the feed plate and having a serles of openingstherein, a table in close engagement with the lower surface of the moldplate, and a rotary reciprocating member adapted to enter the chamber inthe feed plate to force material into the openings in the mold plate.

23. In a molding machine, a movable feed plate havinga chamber therein,a rotary mold plate beneath the feed plate and having a series ofopenings therein, a table in close engagement with the lower surface ofthe mold plate, a rotary member, and means for moving the rotary memberinto the chamber in the feed plate and to and from and means for movingthe mold plate while material is being forced into the opening therein.

11. In a molding machine, a rotary feed plate having a cylindricalchamber therein, a rotary mold plate having a portion pro+ vided with aseries of openings that pass beheath the chamber, a table beneath the.mold plate and in close engagement with the lower surface thereof, arotatable shaft with which the cylindrical chamber may be brought inaxial alinement, a wiper fixed to the end of the shaft, means forreciprocating the shaft to project the wiper into the chamber, a presserfoot adapted to enter the chamber behind the wiper to feed material tothe latter, which in turn forces it into the openings in the mold plate.

12. In a molding machine, a rotary feed plate having a cylindricalchamber therein,

means for intermittently rotating the feed plate, a rotary mold platehaving a portion that passes beneath the chamber and. said portionhaving a series of openings extending through it, a table beneath themold plate and in close engagement with the lower surface thereof, arotatable shaft with which the cylindrical chamber is brought into axialalinement during the period between two of the steps of its intermittentmovement, a wipe; fixed to the shaft, means for recipro eating the shaftto project the wiper into the chamber while the latter is in axial alinement with the shaft, and means for rotating the mold plate while thewiper is rotating in the chamber.

13. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating thefeed plate, arotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extending through it, a tablebeneath the mold plate and in close engagement with the lower surfacethereof, a rotatable shaftwith which the cylindrical chamber is broughtinto axial alinement during the periodbetween two of the steps of itsintermittent movement, a

wiper fixed to the shaft, means for reciproeating the shaft to projectthe wiper into the chamber while the latter is in axial alinement withthe shaft, a feeding mechanism adapted to enter the chamber behind the.

wiper to feed material thereto, and means for rotating the mold platewhile the wiper is rotating in the chamber. 1

14. In a moldmg mach' e, a rotary feed plate having a cylindricalchamber therem,

means for intermittently rotating the feed plate, a rotary mold platehaving a portion that passes beneath the chamber and said portion havinga series of openings extending through it, a table beneath the moldplate and in close engagement with the lower, surface thereof, arotatable shaft with which the cylindrical chamber is brought into axialtaking place While said wiper is inserted within the chamber.

15. In a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, arotary mold plate having a portion that passes beneath the chamber andsaid portion having a series of openings extending through it, a tablebeneath the mold plate and in close engagement with the lower surfacethereof, a rotatable shaft with which the cylindrical chamber is broughtinto axial alinement during the period between two of the steps of itsintermittent movement, a wiper fixed to the shaft, means forreciproeating the shaft to project the wiper into the chamber while thelatter is in axial alinement with the shaft, a presser foot movablelongitudinally in respect to the shaft and adapted to enter the chamberbehind the wiper to feed material thereto, and means for intermittentlyrotating the mold plate, said rotation taking place while the Wiper isinserted within the chamber.

16. In a moldin machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, meansfor holding the plate stationary at the close of each step in itsrotation, a rotary mold plate having a portion that passes beneath thechamber and said portion having a series of openings extending throughit, a table beneath the mold plate and in close engagement withthe lowersurface thereof, a rotatable shaft with which the cylindrical chamber isbrought into axlal alinement during one of the periods that the feedplate is held stationary, means for rotating the shaft, a wiper fixed totheshaft,

means for reciprocating said shaft to project the wiper into the chamberwhile the chamher is in alinement with the shaft, an annular presserfoot slidably mounted on the wiper, a weight for projecting the presserfoot into the chamber behind the wlper tofeed material thereto, andmeans for rotating the mold plate while the wiper is rotating in thechamber.

17. In a molding machine,a rotary feed plate having a cylindricalchamber thereln,

means for intermittently rotating the feed sea engagement with the lowersurface thereof, a rotatable shaft with which the cylindrical eatingsaid shaft to project the wiper into the chamber while the chamber is inalinement with the shaft, an annular presser foot slidably mounted onthe wiper, a weight for projecting the presser foot into the chamberbehind the wiper to feed material thereto, means for rotating the moldplate while the wiperis rotating inthe chamber, means for holding themold plate stationary at other times, and means for removing moldedmaterial from the openings therein While the mold plate is heldstationary.

18. In 'a molding machine, a rotary feed plate having a cylindricalchamber therein, means for intermittently rotating the feed plate, meansfor holding the plate stationary at the close of each step in itsrotation, a rotary mold plate having a portion that passes beneath thechamber and said portion having a series of openings extending throughit, a table beneath the mold plate and in close engagement with thelower surface thereof, a rotatable shaft with which the cylindricalchamber is brought into axial alinement during one of the periods thatthe feed plate is held stationary, means for ro tating the shaft, awiper fixed to the shaft, means for reciprocating said shaft to projectthe wiper into the chamber while the chamber is in alinement with theshaft, an annular presser. foot, slidably mounted on the wiper, a weightfor projecting the presser foot into the chamber behind the wiper tofeed material thereto, means for rotating the mold plate while the wiperis rotating inthe chamber, means for holding the mold plate stationaryat other times, vertically reciprocating punches adapted to force moldedmaterial from the openings in the mold plate while the latter is heldstationary, and means for thereafter removing the molded material frombeneath the mold plate.

19. In a molding machine, a hopper having an opening in the bottomthereof, a retary feed plate, the upper face of which is.

in proximity to the epening in the hopper, the feed plate having aseries of openings therein, means for intermittently rotating the feedplate, means for holding the plate stationary at the close of each stepin its ro tation, a rotary mold plate having a portion that passesbeneath the chamber and said portion having a series of openingsextending through. it, a table beneath the mold plate and incloseengagement with the lower surface thereof, a rotatable shaft with whichthe cylindrical chamber is brought.

into axial alinement during one of the period's that the feed plate isheld stationary,

means for rotating the shaft, a wiper fixed to the shaft means forreciprocating said shaft to pro ect the wiper into the chamber while thechamber is in alinement with the shaft, an annular presser foot slidablymounted on the wiper, a weight for projecting the presser foot into thechamber behind the wiper to feed material thereto, and means forrotating the mold plate while the wiper is rotating in the chamber.

20. In a molding machine, a feed'plate having a series of chamberstherein, means for intermittently rotating the feed plate, means forholding the feed plate stationary at other times, a rotating shaft withwhich the chambers successively come into axial alinement, a wiper onthe shaft, means for reciprocatin the shaft to cause the wiper to enterthe c amber that is in alinement therewith, an annular pressure footslidably mounted on the wiper and arranged to enter the chamber behindthe wiper and feed material thereto, and a weight connected thereto fordetermining the pressure that the p'resser foot may apply to thematerial.

21. In a molding machine, a rotary feed plate having a chamber therein,a movable mold plate having a portion provided with a series of openingsthat pass beneath the chamber, a table beneath the mold plate and inclose engagement with the lower surface thereof, a rotary member, andmeans for changing the relative location of the rotary member and themold plate to cause the rotary member to force material into theopenings in the mold plate.

22. In a molding machine, a movable feed plate having a chamber therein,a mold plate beneath the feed plate and having a series of openingstherein, a table in close engage ment with the lower surface of the moldplate, and a rotary reciprocating member adapted to enter the chamber inthe feed plate to force material into the openings in the mold plate.

23. In a molding machine, a movable feed plate havinga chamber therein,a rotary mold plate beneath the feed plate and having a series ofopenings therein, a table in close engagement with the lower surface ofthe mold plate, a rotary member, and means for moving the rotary memberinto the chamber in the feed plate and to and from the upper surface ofthe mold plate, said r0- tary member being adapted to force materialinto the openings in the mold-plate.

24. In a tablet molding machine, a mold plate, means for supplyingtablet material in a measured quantity upon the mold plate,reciprocating means for compressing said material upon the mold plate,and means in respect to which said reciprocating means is movable foragitating the material while under pressure. v r

25. In a tablet molding machine, a mold plate, means for supplyingtahlet material ing Witnesses.

terial upon the mold plate, and rotary means in respect to which saidreciprocating means is movable for agitating the material While 15 underpressure. v

In testimony whereof We have signed thls specification in the presenceof two subscrib ARTHUR COLTON.

BURTON W. SCOTT.

Witnesses:

T. F. RQELLINGER, EDWARD N. PAGELSEN.

